iPv6 Settings for Time Capsule/Airport Extreme

I've learned that iPv6 has been fully enabled in my state, Maryland, by my Comcast isp. I have now changed my TC iPv6 settings to Automatically and Native. Previously I could only connect to iPv6 sites by using Tunnel mode. Now I can connect in Native and get a 10/10 on those test sites. So everything seems to work correctly. However there is one setting that I'm unclear about. It's the Enable iPv6 connection sharing. I've turned that on and also have block incoming connections toggled on. Do I need to have that connection sharing function toggled on?

All my devices connect to the TC by wifi and all are making the proper connection but I'm still wondering about that sharing option.